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450 Class Electric Helicopters 450 Class Electric Helicopters manufactured by Align, Tarot, SYMA, Airhog, Chaos, HK and similar. |
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12-07-2008, 10:09 AM | #1 (permalink) |
Join Date: Aug 2008
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piro rate?
Can someone explain piro rate to me. how do you adjust it and why do you adjust it?
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12-07-2008, 10:23 AM | #2 (permalink) |
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It is the speed(rate) at which the tail spins one full rotation.
Some high end gyros allow you to adjust this rate, basic gyros do not have this option. You can make the rate faster by lowering the gain. Keep in mind that your tail will be less likely to hold. End points do not change piro rate and I don't recommend anything less than 100% |
12-07-2008, 02:35 PM | #3 (permalink) |
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I disagree. Gain should not be adjusted to change piro rate. Endpoints are used to control piro rate. A search will find numerous threads on the subject.
The reason is (and this applies to any heading hold gyro): stick position does not directly control the tail servo position. Instead, the rudder channel tells the gyro how fast the pilot wants the heli to be turning (pirouetting). In control systems terms, this is the "commanded" piro rate. The gyro moves the servo wherever it needs to, in order to achieve the commanded piro rate. Changing endpoints changes the amount of "command" delivered to the gyro for a given stick position.
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12-07-2008, 02:48 PM | #4 (permalink) |
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Changing your end points and not changing gain or limits will not change piro rate. Try it yourself.
Gyro overrides rudder input in HH mode. Example: End points 75%, gyro gain 50%, fast piro rate. End points 100%, gyro gain 70%, slow piro rate. If you are a new pilot, you shouldn't be worried about piro rate. Set up your gyro correctly and you'll be fine. When I say lowering gain I mean from 75% to 60% makes a huge difference. |
12-07-2008, 04:55 PM | #5 (permalink) |
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Do the search. Read the threads. Most all agree... piro rate is set by endpoints. And, I have tried it. Endpoints work.
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Mark Logo 600se, Scorpion 5020-450, mini-V, Jive 80HV Trex 600 ESP FBL, Scorpion 4025-740, cgy750, CC85HV Trex 450 Vx FBL, Scorpion 2221-10, RJX head, mini-V, Ice 50 |
12-07-2008, 05:01 PM | #6 (permalink) |
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Endpoint or Dual rate sets the piro rate.
Have a look in Bobs tech room he has a few videos that explain it. Lowering the gain will just make the tail loose, nothing more. Darin
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12-07-2008, 06:15 PM | #7 (permalink) | |||
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Quote:
Same here, I used to run 100. Did something that slowed it down (new servo I think) bumped endpoints up to 140 and back to the way I like it.
Until the fatal mechanical failure that is... nothing to do with the piro rate, just a gear assembly failure |
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12-07-2008, 06:31 PM | #8 (permalink) |
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real-spanky ... agreed... dual rates control essentially the same thing ... the maximum/minimum values for the channel coming out of the transmitter.
I think the confusion arises with rudder, because the stick position or value sent from the transmitter to the receiver is commanding rate of turn, not directly the position of the servo.
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Mark Logo 600se, Scorpion 5020-450, mini-V, Jive 80HV Trex 600 ESP FBL, Scorpion 4025-740, cgy750, CC85HV Trex 450 Vx FBL, Scorpion 2221-10, RJX head, mini-V, Ice 50 |
12-07-2008, 06:47 PM | #9 (permalink) |
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They both effect piro rate.
Endpoints and D/R are very similar and are the usual method of increasing or decreasing the piro. D/R is preferred as it does not effect the center point of the channel. The gain can also effect the piro rate. If you are able to run a very high gain then you will notice that your piro will be on the slow side. Conversely if your gain is on the low side of things then your piro will be faster. The gain isn't really the place to adjust the piro rate from however.
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12-07-2008, 10:29 PM | #10 (permalink) |
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JR on there Gyros recommend using dual rate to control piro and expo if needed
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"So What is 3D Flying" Definition: 3D as applied to current rc helicopter flying is any maneuver that to be performed requires the constant harmonized input of three or more controls simultaneously while the maneuver is taking place. |
12-08-2008, 01:01 PM | #11 (permalink) |
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Yep, it's enpoints that adjust your piro rate.
Skarn |
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